/*
 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */

package javax.security.auth;

/**
 * Objects such as credentials may optionally implement this interface
 * to provide the capability to destroy its contents.
 *
 * @see javax.security.auth.Subject
 */
public interface Destroyable {

    /**
     * Destroy this {@code Object}.
     *
     * <p> Sensitive information associated with this {@code Object}
     * is destroyed or cleared.  Subsequent calls to certain methods
     * on this {@code Object} will result in an
     * {@code IllegalStateException} being thrown.
     *
     * <p>
     * The default implementation throws {@code DestroyFailedException}.
     *
     * <p>
     * Android note: Up to and including API 25 this method did not have a
     * default implementation. Implementations of this interface must provide
     * a concrete implementation of this method in order to work on older
     * versions of Android.
     *
     * @exception DestroyFailedException if the destroy operation fails. <p>
     *
     * @exception SecurityException if the caller does not have permission
     *          to destroy this {@code Object}.
     */
    public default void destroy() throws DestroyFailedException {
        throw new DestroyFailedException();
    }

    /**
     * Determine if this {@code Object} has been destroyed.
     *
     * <p>
     * The default implementation returns false.
     *
     * <p>
     * Android note: Up to and including API 25 this method did not have a
     * default implementation. Implementations of this interface must provide
     * a concrete implementation of this method in order to work on older
     * versions of Android.
     *
     * @return true if this {@code Object} has been destroyed,
     *          false otherwise.
     */
    public default boolean isDestroyed() {
        return false;
    }
}